Aerojet N2O4/Aerozine-50 rocket engine family for the Titan booster stage. The Aerojet LR87 was the only engine known in the world that was operated (with modifications) using all three major propellant combinations: kerosene RP-1 and liquid oxygen; storable hydrazine and nitrogen tetroxide; and liquid hydrogen and liquid oxygen.

The engine was tested with less success using nitrogen tetroxide and a gelled aluminized version of Aerozine-50. Some studies and development work were done on a fluorine/hydrogen version of the engine.

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LR87-3 Aerojet LOx/Kerosene rocket engine. Titan 1 booster engine. Surplus Flight Engines were available for various uses in the 1960's. First flight 1959.

LR87 LH2 Aerojet LOx/LH2 rocket engine. Development ended 1961. Version of the Titan engine, and first large LOx/LH2 engine fired in the world. 52 static tests. But NASA selected Rocketdyne instead to develop the J-2 engine for Saturn from scratch.